Malicious PDF — malware analysis report

Static analysis result for SHA-256 90be19b3a5c05be1…

MALICIOUS

PDF

63.7 KB Created: 2021-06-21 04:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c595e291acfbe7ab5fdf70acc679254 SHA-1: 82b2fb95fc03c434cc9d2ad1ba0d7c62c61129b6 SHA-256: 90be19b3a5c05be1c4290604d43bae17a258c19e95f808fd59a1aafe66bcfd83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b0f89ca4a2b13bb32fb097211401a07/27086427251.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e78ec1218---jofirisiguk.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/60556511516.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a4a4b2ecca90ff23237179e0872082b5/45597366505.pdf
    • http://dent-pro.cz/pic/file/dejuwipo.pdf
    • http://learningkey.org/userfiles/wazokevezuvisijefiradub.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e2e8f86390a691ca22116866676d4e20/1599650918.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608cb7dd68b62---31754222484.pdf
    • https://cmoretv.com/userfiles/bivuretuzipiseza.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c03734a082619c632c10f98818edb058/38849354934.pdf
    • http://www.gonouvellezelande.com/files/rogexixiset.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41b19510a---16082021662.pdf
    • https://hinodanang.com/uploads/image/files/10806823838.pdf
    • https://menu2uplus.com/images/file/66785568275.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca866eafa2---ligabozuxudokusiw.pdf
    • https://intellicapital.in/ckfinder/userfiles/files/53360281077.pdf
    • http://darec.sk/files/files/94974718014.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc69c688fc---77978518459.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=endendigu+kannada+mp3+song+download
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb44.bin
a508f1199286c57efaf5ee6c1c4ef97a79fed77db7255e50440f73067d203bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 5460 bytes

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